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Electrical Machines

Electrical Machines
In synchronous motor the torque is proportional to

 P²
 1/P
 1/P²
 Power P

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Capacitor start.
  Shaded pole.
  Split phase.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of crawling.
  increase the starting torque.
  reduce the magnetizing current.
  reduce the chance of cogging.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator armature terminal.
 motor field terminal.
 motor armature terminal.
 generator field terminal.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 4KVA
 20KVA
 0KVA

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Electrical Machines
The emf induced in the dc generator armature winding is

 DC
 AC
None of these
 AC and DC

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MORE MCQ ON Electrical Machines

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